| 摘要 |
PURPOSE:To prevent leak of load due to increase of peak output, in a power source equipment for an imaging device by exciting a transformer intermittently with the output from a high frequency oscillator and controlling DC input at the primary of the transformer based on an average output level being detected. CONSTITUTION:A transformer T1 is driven with high frequency through a 50kHz oscillator and double voltage rectification is carried out at the secondary thereof. Furthermore, duty ratio of AC component can be varied through terminal P2. Since the average DC level of the output signal is fed back to the primary of the transformer T1 in order to perform duty ratio control of driving pulse, leak of load due to increase of DC peak output level is prevented by providing a proper reference value from the terminal P2: it serves improvement of reliability of the entire device to which the power source equipment is applied. |
